Nation Master
Welcome to NationMaster, a massive central data source and a handy way to graphically compare nations. NationMaster is a vast compilation of data from such sources as the CIA World Factbook, UN, and OECD. Using the form on the hone page, you can generate maps and graphs on all kinds of statistics with ease. The sites claims to be the web's one-stop resource for country statistics on everything from obesity tomurders.
http://www.nationmaster.com/index.php

U.S. Census Bureau

The mission of the Census Bureau is to serve as the leading source of quality data about the nation's people and economy

**http://www.census.gov/aboutus/#**

Ask Dr. Math

Ask Dr. Math is a question and answer service for math students and their teachers out of Drexel University. A searchable archive is available by level and topic, as well as summaries of Frequently Asked Questions. Includes pages of formulas.
**http://www.mathforum.org/dr.math/abt.drmath.html**

Math Lessons from Thinkfinity

More than 130 lesson plans from this excellent site.
http://tinyurl.com/4ymwuag

Wolfram Alpha

Free online access to the Wolfram|Alpha computational knowledge engine:
answer questions; do math; instantly get facts, calculators, unit conversions, and real-time quantitative data and statistics; create plots and visualizations; and access vast scientific, technical, chemical, medical, health, business, financial, weather, geographic, dictionary, calendar, reference, and general knowledge—and much more.
http://www.wolframalpha.com/